Room air filter



FIG. 1 is a top, front and side perspective view of a room air filter, showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a side elevational view thereof, the opposite side being a mirror image of that shown; and,

FIG. 6 is a rear elevational view thereof. 

The ornamental design for a room air filter, as shown and described. 